Tulowitzki was scheduled to play seven innings at shortstop for Triple-A Colorado Springs against Las Vegas on Friday night. He had gone 3-for-6 with a home run in two previous games for the Sky Sox.

Tulowitzki hasn't played in the Majors since the end of May because of a left groin injury that required surgery. Tulowitzki played at Double-A Tulsa before joining the Sky Sox.

It's not clear if the Rockies will immediately activate Tulowitzki on Saturday, the first day that teams can expand their active rosters to the 40-man limit.

But injuries in recent weeks have forced the Rockies to call up several young players who would, under normal circumstances, be September callups.

The only names Tracy announced on Friday were those of Giambi, who has missed 35 games because of viral syndrome, and Moscoso, who has bounced between the Rockies and Colorado Springs for most of the season.

Like Tulowitzki, Giambi has played rehab games at Tulsa and Colorado Springs.